<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    #box {
      width: 200px;
      height: 200px;
      background-color: red;
    }
  </style>
</head>

<body>
  <div id="box"></div>
  <script>
    var box = document.querySelector('#box');
    // 移动端同样支持mousedown
    // mousedown 会有300ms延迟
    box.addEventListener('mousedown', function (e) {
      console.log(1)
    });

    box.addEventListener('touchstart', function (e) {
      console.log(2)
    });
  </script>
</body>

</html>